Amazon.com: NP99sp Battery Kit for Garmin Drive 50, 50LM, 50LMT with Video Instructions, Tools, and Extended Life Battery from NewPower99 : Electronics
Amazon.com: Synergy Digital GPS Battery, Compatible with Garmin 361-00056-50 GPS, (Li-Ion, 3.7V, 1100 mAh) Ultra High Capacity, Replacement for Garmin 361-00056-00 Battery : Electronics